The Influence Of Different Fertilization Systems On Soil Acidification

This research is within the typical meadow black soil in the black soil were usedfor soil to study the effects of long-term different fertilization on black soil aciditychanged, the long-term different fertilization conditions of soil acidity change lawwere analyzed. The results show that:(1) Soil with the chemical fertilizer, compared with the control group, all thefertilizer treatments of soil pH value is lower than the control group the soil pH value,pH value size order: PK NK <NPK <N <NP <<K <P, soil pH lowest in NK, pH is5.89. N processing soil exchangeable H+, the highest content of Al3+, H+exchangesex, Al3+content for0.3cmol/kg,0.13cmol/kg. Organic material (0.125kg/m2) withfertilizer in the soil, the soil pH value is lower than the control group, soil pH lowestin NK, pH is6.31. P treatment soil exchangeable H+the highest levels, exchangeableH+concentration is0.11cmol/kg, NK dealing with the highest content of soilexchangeable Al3+, exchangeable Al3+content for0.17cmol/kg. Organic material(0.25kg/m2) with fertilizer in the soil, the control group the highest soil pH, soil pHlowest in NK, soil pH is6.27. NPK treatment exchangeable H+the highest levels, theexchange of sexual content of H+0.14cmol/kg, NK, NP treatment exchangeable Al3+the highest levels, the content of exchangeable0.15cmol/kg.（2）Soil with the chemical fertilizer, Control the highest organic matter content,organic matter content is34.2g/kg, organic matter content lowest in N, organic mattercontent is26.5g/kg. Organic material (0.125kg/m2) with fertilizer in the soil, thefertilizer processing organic matter content of the soil organic matter content is lowerthan the control group, PK treatment of soil organic matter content is the lowest,organic matter content is27.34g/kg. Organic material (0.25kg/m2) fertilizer in thesoil, and K to deal with the highest levels of soil organic matter, organic mattercontent as high as35.45g/kg, minimum PK treatment of soil organic matter content,organic matter content is28.33g/kg.（3）Soil with the chemical fertilizer, Control group the highest soil exchangecapacity, exchange capacity of25.23cmol/kg, NPK treatment lowest soil exchangecapacity, exchange capacity of22.85cmol/kg. Organic material (0.125kg/m2) withfertilizer in the soil, the soil exchange capacity is lower than the control group, NPKtreatment lowest soil exchange capacity, exchange capacity of26.89cmol/kg. Organicmaterial (0.25kg/m2) with fertilizer in the soil, the control of soil exchange capacity, highest K lowest soil exchange capacity, exchange capacity of27.48cmol/kg. Soilexchangeable calcium soil base of total ion proportion is the largest, the second isexchangeable magnesium, exchangeable sodium, exchangeable potassium.(4) Through analysis on different fertilization soil buffer performance, add thesoil of the organic material, acid-base titration curve is relatively flat, the soil pHmutation range is small, the acid-base buffering performance is higher. Fertilization ofchemical fertilizer in the soil, acid and alkali titration curve overall trend steep, largerange of the soil pH mutation, low pH buffer performance. Single or with N fertilizerand soil ph buffer capacity are smaller, the control group the highest soil ph buffercapacity. Fertilization of N fertilizer soil acidification rate value maximum, minimumvalue control soil acidification rate.(5) Increasing soil organic matter content, soil exchange capacity, and the totalbase, can reduce soil exchangeable acid, soil exchangeable H+, Al3+content. Reducesoil exchangeable acid, soil exchangeable H+, Al3+content, soil pH value can beimproved. With soil exchangeable calcium soil buffer capacity, total base ions,exchange capacity was significantly positively related; Soil acidification rate and totalsoil base ions, exchange capacity was significantly negative correlation.Given all this, long-term fertilization of chemical fertilizer will cause soil pH isreduced, to accelerate the process of soil acidification. Single or with N fertilizer onsoil acidification effect is the most significant. The organic material with fertilizer canreduce speed by reducing the soil pH value, to ease the soil acidification. So,reasonable fertilization to alleviate soil acidification with highly efficient adjustment.